What is the immediate outcome when a sperm successfully reaches an egg?

• The egg immediately divides into two cells.

• The sperm fuses with the egg, leading to fertilization.

• The egg releases chemicals to attract more sperm.

• The sperm transforms into an embryo.

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What is the process where the early embryo embeds itself into the uterine wall?

• Ovulation

• Gastrulation

• Implantation

• Cleavage

What is one of the earliest visible structures to form in the developing embryo?

• Limbs

• Eyes

• Heart

• Spinal cord

When do distinct fingers and toes begin to form in the developing human?

• During the first week of development

• Around 8-9 weeks of development

• During the second trimester

• Just before birth